ZipExec – A Unique Technique To Execute Binaries From A Password Protected Zip

ZipExec is a Proof-of-Concept (POC) tool to wrap binary-based tools into a password-protected zip file. This zip file is then base64 encoded into a string that is rebuilt on disk. This encoded string is then loaded into a JScript file that when executed, would rebuild the password-protected zip file on disk and execute it. This is done programmatically by using COM objects to access the GUI-based functions in Windows via the generated JScript loader, executing the loader inside the password-protected zip without having to unzip it first. By password protecting the zip file, it protects the binary from EDRs and disk-based or anti-malware scanning mechanisms.

Installation

The first step as always is to clone the repo. Before you compile ZipExec you’ll need to install the dependencies. To install them, run following commands:

go get github.com/yeka/zip

Then build it

go build ZipExec.go

or

go get github.com/Tylous/ZipExec

Help

./ZipExec -h

__________.__      ___________                     
____    /|__|______   _____/__  ___ ____   ____  
  /     / |  ____ |    __)_  /  // __ _/ ___ 
 /     /_ |  |  |_> >        >    <  ___/  ___ 
/_______ |__|   __/_______  /__/_ \___  >___  >
        /   |__|          /      /    /     / 
                (@Tyl0us)

Usage of ./ZipExec:
  -I string
        Path to the file containing binary to zip.
  -O string
        Name of output file (e.g. loader.js)
  -sandbox
        Enables sandbox evasion using IsDomainedJoined.